add purchace limitations system for rancher - add incentive plans to rancher entries data

apps/herd/models.py

@@ -127,6 +127,9 @@ class Rancher(BaseModel):
         null=True
     )
     without_herd = models.BooleanField(default=False)
+    ignore_purchase_limit = models.BooleanField(
+        default=False, help_text="if its true rancher has not buy limitations"
+    )
 
     def __str__(self):
         return f'rancher: {self.first_name} {self.last_name}'